Rubyhash

by builtbyproxy

275 downloads

Not rated

GitHub Website

Developer Tools

About

MCP server that diffs Ruby hashes for AI coding agents. Paste failing Minitest/RSpec output and get exactly what changed: added, removed, and changed keys with type-change detection. Runs 100% locally, nothing uploaded. From rubyhash.dev

Details

Author: builtbyproxy
Downloads: 275
Categories: Developer Tools

Setting up with Highlight

This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:

Download and install Highlight from highlightai.com/download
Navigate to the plugins tab and select "Add Custom Plugin"
Configure the plugin with the settings below

Plugin Name Rubyhash

Command (node, npx, python, etc.)

Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
Enable "Start Automatically" if you want the plugin to start when Highlight launches

Setting up with Cursor

Open Cursor's settings
Navigate to the MCP section
Click "Add new Global MCP server"
Copy and paste the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

Setting up with Claude Desktop

Open Claude Desktop's settings
Go to the Integrations tab
Click "Add MCP Server"
Use the configuration below based on your operating system

Note: Make sure Claude Desktop is running before attempting to connect.

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

Setting up with Windsurf

Open Windsurf's preferences
Go to the Integrations section
Click "Add MCP Integration"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

Setting up with Cline

Open Cline's settings
Navigate to the Integrations section
Click "Add MCP Server"
Copy and paste the configuration below based on your operating system

Note: Make sure to restart Cline after adding the configuration.

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

Setting up with Goose

Open Goose's preferences
Go to the Integrations tab
Select "MCP Servers"
Click "Add New Server"
Use the configuration below based on your operating system

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

JSON

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

From the repository

The README includes setup instructions such as "command": "npx",.

`ruby_hash_diff`

Compare two Ruby hash literals and return exactly what changed: changed values with before/after, added and removed keys, and explicit type changes (nil to String, Integer to Float, symbol vs string keys). Pass either `expected` and `actual` as Ruby hash strings, or pass raw failing Minitest/RSpec output in `raw` and the first two hash literals found will be compared. Much cheaper and more reliable than eyeballing large nested hashes in test output.

`ruby_to_json`

Parse a Ruby hash or array literal (hashrockets, symbol keys, shorthand syntax, nesting, nil/true/false) and return clean JSON with alphabetically sorted keys. Symbols are rendered as ":name" strings.

Claude Desktop / Cursor

Paste into your MCP client config file to install this server.

{
    "mcpServers": {
        "rubyhash": {
            "rubyhash": {
                "command": "npx",
                "args": [
                    "-y",
                    "rubyhash-mcp"
                ]
            }
        }
    }
}

McpServers

{
    "rubyhash": {
        "command": "npx",
        "args": [
            "-y",
            "rubyhash-mcp"
        ]
    }
}

rubyhash-mcp

MCP server for RubyHash. Gives any MCP-capable agent (Claude Code, Claude Desktop, Cursor, and others) two deterministic Ruby tools:

- ruby_hash_diff: compare two Ruby hash literals, or paste raw failing Minitest/RSpec output, and get a structured report of exactly what changed: changed values with before and after, added and removed keys, and explicit type changes (nil to String, Integer to Float, symbol keys vs string keys).
- ruby_to_json: convert a Ruby hash or array literal (hashrockets, symbol keys, shorthand syntax, nesting, nil/true/false) to clean JSON with sorted keys.

Everything runs locally in the server process. Nothing is uploaded, logged, or stored, the same privacy promise as rubyhash.dev.

Why an agent would want this

When a Ruby test fails on two large nearly identical hashes, comparing them by reading is slow and error prone, for humans and for language models. A 40-key nested hash diff burns context and invites mistakes. This server does the comparison with a real recursive descent parser and hands back only the differences, deterministically.

Install

{
  "mcpServers": {
    "rubyhash": {
      "command": "npx",
      "args": ["-y", "rubyhash-mcp"]
    }
  }
}

Or for Claude Code:

claude mcp add rubyhash -- npx -y rubyhash-mcp

Example

Input (raw test output):

-{"uid"=>"u@example.test", "role"=>"admin", "seats"=>3}
+{"uid"=>"u@example.test", "role"=>"editor", "seats"=>3.0}

Output:

{
  "equal": false,
  "summary": "2 changed, 0 added, 0 removed, 1 type change",
  "changed": [
    { "path": "role", "before": "admin", "after": "editor", "typeChanged": false },
    { "path": "seats", "before": 3, "after": 3, "beforeType": "Integer", "afterType": "Float", "typeChanged": true }
  ]
}

Also available as an HTTP API

If you cannot run a local MCP server, the same tools are exposed at the RubyHash Agent API, with an OpenAPI description and an x402 machine-payable catalog.

Development

npm install
npm test   # 36 unit tests

License

No reviews yet — be the first

Use Google, GitHub, or an email account so ratings stay tied to real people.

Email sign in

No reviews posted yet.

About

Details

Jump to

Setting up with Highlight

From the repository

ruby_hash_diff

ruby_to_json

Claude Desktop / Cursor

McpServers

rubyhash-mcp

Why an agent would want this

Install

Example

Also available as an HTTP API

Development

License

Install

More like this

Sentry

Github

Git

GitLab

Context 7

Playwright

`ruby_hash_diff`

`ruby_to_json`